diff --git a/dna_read.sh b/dna_read.sh
index 2267e81baca12270c4fe88d33ec7c9102058112f..110e695c57775be5d91e574294845dbd66991bd9 100755
--- a/dna_read.sh
+++ b/dna_read.sh
@@ -10,7 +10,7 @@ source "$project_dir"/workflow_commands/log_manager.sh #load the log manager scr
 help_function () {
    echo ""
    echo "Usage: dna_read [-n_read int] Cname DI Dname"
-   echo -e "\t-n_read : number of molecules to read [default = 10*n_frag]"
+   echo -e "\t-n_read : number of molecules to read [default = 50*n_frag]"
    echo -e "\tCname : path to the container"
    echo -e "\tDI : index of the document to read"
    echo -e "\tDname : path to save the document"